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\ UNITED STATES PATENT OFFICE.

ROBERT A. GRAHAM, OF OARROLLTON, OHIO, ASSIGNOR OF ONE-HALF TO ROBERT E. MCDONALD AND WILLIAM G. EBERSOLE, BOTH OF SAME PLACE.

DENTAL AN/ESTHETIC.

SPECIFICATION forming part of Letters Patent No. 420,653, dated February 4, 1890.

Application filed September 26, 1889. Serial No. 325,200. (No specimens.) I

To all whom it 11mg concern.-

Be it known that I, ROBERT A. GRAHAM, a citizen of the United States of America, residing at (larrollton, in the county of Carroll and State of Ohio, have invented certain new and useful Improvements in Local Anaesthetics, of which the following is a specification, reference being had therein to the accompanying drawings.

My object is to provide a simple, safe, and eifective compound adapted for use in the practice of dentistry, or for minor surgical operations, which will render painless the extraction of teeth, and at the same time will not in any wise affect the health of the party upon whom it is used.

My improved compound consists of the following ingredients, combined in the proportions stated, viz: alcohol, five and two-thirds drains; glycerine, two and one-sixth drains; tincture of aconite, one-sixth dram; menthol, ten grains; sulphate of cocaine, thirty-five grains. These ingredients are to be thoroughly mixed, and the compound should always be well shaken before using.

IVherethis anaesthetic is used for preventing pain in extracting teeth, three or four drops are injected into the gums on each side of the tooth with a hypodermic syringe, and from thirty to ninety seconds allowed to elapse before proceeding to extract the tooth.

For minor surgical operationsthe compound is applied locally to the parts.

While I consider the above proportions as being best adapted for the purpose, I do not intend to confine myselfstrictly to the same, as I am aware that the anaesthetic eifect may be produced by the use of the ingredients in other proportions than thosestated above.-

WVhat I claim, and desire to secure by Letters Patent, is-

The composition of matter hereinbefore described, consisting of alcohol, glycerine, tincture of aconite, menthol, and sulphate of cocaine, to be used as a local anaesthetic.

In testimony whereof I aflix my signature in presence of two witnesses.

ROBERT A. GRAHAM.

Witnesses:

U. (3. BEFORE, .T. R. NEELY. 

